I was visiting my girlfriend's house when her older sister walked into the room right after getting out of the bath—completely naked. "Why are you so embarrassed? We used to bathe together, remember?" Her words left me speechless. Her body had become even more feminine and alluring with age. Her breasts had grown larger, her curves softer, and her pubic hair was thick and well-grown. Overwhelmed by her exposed beauty, I could no longer suppress my desire. Without telling my girlfriend, I took a step further with her sister. Tempted by the mature charm of my girlfriend's older sister, I crossed the line into a forbidden relationship—a thrilling, heart-pounding moment.